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Added code comments to parse_chf.

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s3lph 2018-07-20 15:25:06 +02:00
parent 862a0e6fa8
commit a4930d268d
1 changed files with 6 additions and 0 deletions
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6
matemat/webserver/util.py
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@ -168,21 +168,27 @@ def parse_chf(value: str) -> int:
:return: An integer representation of the value. :return: An integer representation of the value.
:raises: Value error: If more than two digits after the decimal point are present. :raises: Value error: If more than two digits after the decimal point are present.
""" """
# Remove optional leading "CHF" and strip whitespace
value = value.strip() value = value.strip()
if value.startswith('CHF'): if value.startswith('CHF'):
value = value[3:] value = value[3:]
value = value.strip() value = value.strip()
if '.' not in value: if '.' not in value:
# already is an integer; parse and turn into centimes
return int(value, 10) * 100 return int(value, 10) * 100
# Split at the decimal point
full, frac = value.split('.', 1) full, frac = value.split('.', 1)
if len(frac) > 2: if len(frac) > 2:
raise ValueError('Needs max. 2 digits after decimal point') raise ValueError('Needs max. 2 digits after decimal point')
elif len(frac) < 2: elif len(frac) < 2:
# Right-pad fraction with zeros ("x." -> "x.00", "x.x" -> "x.x0")
frac = frac + '0' * (2 - len(frac)) frac = frac + '0' * (2 - len(frac))
# Parse both parts
ifrac: int = int(frac, 10) ifrac: int = int(frac, 10)
ifull: int = int(full, 10) ifull: int = int(full, 10)
if ifrac < 0: if ifrac < 0:
raise ValueError('Fraction part must not be negative.') raise ValueError('Fraction part must not be negative.')
if full.startswith('-'): if full.startswith('-'):
ifrac = -ifrac ifrac = -ifrac
# Combine into centime integer
return ifull * 100 + ifrac return ifull * 100 + ifrac